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- <h3 class="title"><a id="plug-in-decompose"></a>3.16. Decompose</h3>
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- <p>
- This filter is found in
- <span class="guimenuitem">Image>Filters/Colors/<span class="accel">D</span>ecompose</span>
- </p>
- <p>
- This filter separates an image into its different components (RGB, HSV...).
- </p>
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- <h4 class="title"><a id="id3475509"></a>Options</h4>
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- <dl>
- <dt>
- <span class="term">Decompose to Layers</span>
- </dt>
- <dd>
- <p>
- If this option is checked, greyscaled images will not be displayed straight away.
- </p>
- </dd>
- <dt>
- <span class="term">RGB Decomposing</span>
- </dt>
- <dd>
- <p>
- If the RGB radio button is clicked, a grey level image is created with three layers (Red, Green
- and Blue), and two channels (Grey and Alpha).
- </p>
- <p>
- This function is interesting when using Threshold tool. You can also perform operations like
- cutting, pasting or moving selections in a single RBG channel. You can use an extracted
- grayscale as a selection or mask by saving it in a channel (right-click>Select>Save to a
- channel).
- </p>
- </dd>
- <dt>
- <span class="term">RGBA Decomposing</span>
- </dt>
- <dd>
- <p>
- If the RGBA radio button is clicked, a image is created similar at the RGB Decomposing
- with a additional Alpha layer filled with the transparencies values of the source image.
- The full translucent pixels are black and the full opaque pixels are white.
- </p>
- </dd>
- <dt>
- <span class="term">HSV Decomposing</span>
- </dt>
- <dd>
- <p>
- This option decomposes image into three greyscaled layers, one for Hue, one for Saturation
- and another for Value.
- </p>
- <p>
- Although <span class="guilabel">Hue</span> is greyscaled, it does represent hues. In color circle,
- white and black are starting point and are superimposed. They represent Red color at top of
- circle. Grey intermediate levels are corresponding to intermediate hues on circle: dark grey to
- orange, mid grey to green and light grey to magenta.
- </p>
- <p>
- <span class="guilabel">Saturation</span> and <span class="guilabel">Value</span>: White is maximum Saturation
- (pure color) and maximum Value (very bright). Black is minimum Saturation (white) and minimum
- Value (black).
- </p>
- </dd>
- <dt>
- <span class="term">CMY Decomposing</span>
- </dt>
- <dd>
- <p>
- This option decomposes image into three greyscaled layers, one for Yellow, one for Magenta
- and another for Cyan.
- </p>
- <p>
- This option might be useful to transfer image into printing softwares with CMY capabilities.
- </p>
- </dd>
- <dt>
- <span class="term">CMYK Decomposing </span>
- </dt>
- <dd>
- <p>
- This option is similar at the <span class="guilabel">CMY Decomposing</span> with a additonnal
- layer for Black.
- </p>
- <p>
- This option might be useful to transfer image into printing softwares with CMY capabilities.
- </p>
- </dd>
- <dt>
- <span class="term">Alpha Decomposing</span>
- </dt>
- <dd>
- <p>
- This option extracts the image transparency stored in the Alpha channel in
- <a href="ch04s03.html" title="3. Channels dialog">Channel dialog</a>
- in a separate image. The full translucent pixels are Black the full opaque
- pixels are white. The graytones are smooth transitions of the transparency
- in the source image.
- </p>
- </dd>
- <dt>
- <span class="term">LAB Decomposing</span>
- </dt>
- <dd>
- <p>
- This option decomposes image into three greyscaled layers, layer "L"
- for Luminance, layer "A" for colors between green and red, layer "B"
- for colors between blue and yellow.
- </p>
- <p>
- The LAB Decomposing is a color model of the Luminance-Color family. A channel is
- used for the Luminosity while two other channels are used for the Colors.
- The LAB color model is used by Photoshop.
- </p>
- </dd>
- <dt>
- <span class="term">YCbCr Decomposing</span>
- </dt>
- <dd>
- <p>
- In Gimp there is four YCbCr decompositions with different values. Each option
- decomposes image in three greyscaled layers, a layer for Luminance and two other
- for blueness and redness.
- </p>
- <p>
- The YCbCr color model also called YUV is now used for digital video (initially for
- PAL analog video). It's based on the idea that the human eye is most sensitive to
- luminosity, next to colors. The YCbCr Decomposing use a transformation matrix and
- the different options are different values recommanded by ITU (International
- Telecommunication Union) applied to the matrix .
- </p>
- </dd>
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